The Thermowell, cataloged under National Stock Number 6685-01-485-8437, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Fincantieri Marine Systems North America, Inc. Dba Fincantieri Marine Systems North Am. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-485-8437 |
| Primary Part Number | MHC189 |
| Item Name | Thermowell |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Fincantieri Marine Systems North America, Inc. Dba Fincantieri Marine Systems North Am |
| Status | ACTIVE |
| Style Designator | THREADED STRAIGHT SHANK |
| Material Document and Classification | AISI 316 ASSN STD 1ST MATERIAL RESPONSE |
| Bulb Tip Outside Diameter | 0.500 INCHES NOMINAL IN |
| External Thread Size | 1.250 NPT1.250 NPT |
| Bulb Tip Length | 1.314 INCHES NOMINAL IN |
| Straight Bore Depth | 1.935 INCHES NOMINAL ALL BORES IN |
| Internal Thread Size | 3/4UNS ALL BORES |
| Material | STEEL COMP 316 |
| Bore Inside Diameter | 0.383 INCHES NOMINAL ALL BORES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MHC189 PRIMARY | Fincantieri Marine Systems North America, Inc. Dba Fincantieri Marine Systems North Am (USA) |
NSN 6685-01-485-8437 is a Thermowell, manufactured by Fincantieri Marine Systems North America, Inc. Dba Fincantieri Marine Systems North Am, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-485-8437 has 1 manufacturer part number on file: MHC189 (Fincantieri Marine Systems North America, Inc. Dba Fincantieri Marine Systems North Am).
Key specifications for MHC189: Style Designator: THREADED STRAIGHT SHANK; Material Document and Classification: AISI 316 ASSN STD 1ST MATERIAL RESPONSE; Overall Length: 3.250 INCHES NOMINAL3.250 INCHES NOMINAL IN; Bulb Tip Outside Diameter: 0.500 INCHES NOMINAL IN. 9 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.